Art of color-printing.



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CLARENCE P. BROl/VNING, O

ATENT OFFICE.

E MANHAssET, NEw YORK.

ART OF COLOR-PRINTING.

SPECIFICATION forming part Of Letters PatentNo. 698,255, dated April 22,1902.

Application filed October 25, 1901.

To @ZZ whom t may concern:

Be it known that I, CLARENCE P. BROWN- ING, a citizen of the UnitedStates, and a resident of Manhasset, in the county of Nassau and Stateof New York, have invented certain new and useful VImprovements iu theArt of Color-Printing, of which the following isa specification.

This invention relates to an improvementl in the art of printing incolors, and has for its main object to so construct a supplemental` bedand the plates to be used thereon that perfect registry of succeedingplates may beV readily effected and likewise perfect 'registry ofsucceeding sheets to be printed.

In printing in several colors-say, for ex-l each of the three platesshall occupy in succession exactly the same place on the bed 'of thepress. It is also desirable that one plate may be replaced by anotherrapidly as well as accurately. It is also just as necessaryvr anddesirable that each of the succeeding sheets shall register accuratelyupon succeeding plates and that the registry thereof may be readily andrapidly effected. By my invention these ends are attained, and ittherefore consists in the construction, combination, and arrangement ofparts, as hereinafter fully described and claimed.

The two things most essential to the practice of my invention are theconstruction of the plates, whereby they may be made to register onewith the other, and the construction of the bed, whereby to eect theregistry of succeeding plates andsu'cceeding sheets. Thesel thingsareillustrated in the accompanying drawings, wherein- Figure l is a planof a plate representingvv the adaptation of my invention thereto. Fig. 2is a section therethrough on therline 2 2. Fig. 3 is aplan of asupplemental bedfora Washington handlpress, showing the=appli cation ofthe second feature of my invention. Fig. 4L is a sectional view of saidbed taken on the line4 4, and Fig. 5 is an edge view of said bed.V Fig.6 is a detail of a modification.

This invention has to do especially with what is popularly known ashalf-tone work and similar modes of reproduction wherein photography isemployed.

The usual plan for registering the plates of Serial No. 79.897. (Nomodel.)

a color series is to provide the plates with holes and the bed withpins. In doing the first of these acts there has been great liability toerror, and the second results in destructionof the bed. I provideregistry-holes in the plates by making upon the drawing from which theplates are to be made registrymarks in the form of a circle whosecentral space, when reproduced upon the plates, will he the diameter ofthe drill used for making the registry-holes. Thesecircles arepreferably made at the top and bottoml of the drawing,though theymay bemade at any other desired points. These circles are reproduced asannular walls upon the plates, asshown These walls make at A in Figs. land 2. little wells the size of the diameter of the drill to be used inboring the 4registry-holes and guide the drill to its work. At B thehole is shown as drilled through such a well. As

plate of the s'eries, and thereby the registryholes are accuratelylocated.

each plate in a color series is produced from A bed for color-printingmust be constructed 1 to take plates of various'sizes and shapes.lTherefor to avoid driving it full of holes for registry-pins I havedevised a structure whereby one pair of pins will serve for all sizesand i `shapes of platesf Figs. 3 to 5 illustrate such a structurefTherein C refers to the supplel mental bed, which may be made of anydesirable material-for instance, castiron. it are formed channels,preferably undercut, as seen at D, and in these channels are lo-l catedslides, as E, fitted snugly thereto, yet capable of free longitudinalmovement, and having their upper edges flush with the top of the bed andas narrowas practical,-so as vto maintain as nearly as possible thesurface 1of theplaten unbroken. Inthe slides E at 4their inner ends arethe registry-pins F, which project above the surface ofthe bedand areVmade to closely fit the registry-holes'in the plates. Pins thus mountedmaybe moved to any desired distance fromthe center of the bed toproperly locate different series of plates. The slides may be fixed inany adjusted position in various ways. One of such Ways is shown in thedrawings, wherein abutments, as G, are located at the sides of thechannels IOO D on the edge of the bed, and through one of these ispassed a set-screw H. l do not confine myself to any particular way ofadjusting the slides longitudinally nor of securing them in adjustedpositions. p

Having made provisions for absolute accuracy in locating on the bed theplates of a color series, it is next essential to locate accurately thesheets to be printed on each sueceeding plate of the series. This I doby placing at each side of the platea sharp pin, as K, which pins piercethe sheet in its application to the first plate. Then in its applicationto the-succeeding plates the pins are made to enter again the holes thusformed. A sheet is indicated in coarse broken lines at L, Fig. l, as inposition upon the pins K and overlying the plate, which is indicated byiine broken lines, as at M. The pins K are preferably pointed and aremounted on slides O, constructed in substantially the same mannel" asthose bearing the pins F, and these slides are adjustable in the samemanner in all respects as are the slides E, so as to aecomlmodate sheetsof different sizes. This supplemen tal bed may be Varied in shape andsize, and while especially designed for use on a Washington hand-pressit may obviously be used on other presses and even locked in a form, ifdesired. When used in this latter Way or in a press Where in operationit would be turned faoe downward, the pins F may be replaced byremovable hooks or headed pins, as indicated in Fig. (i at F', whichwill hold the plate securely to the bed Whatever the position of thebed. These and other changes may be made without departing from myinvention.

I claim as my inventionl. Aplateforprintinghavingannularwalls formedthereon as guides for drilling registryholes, the center space or wellformed by said wall beting of the diameter of the drill used in boringthe registry-holes.

2. A series of plates for color-printin g, each of which plates hasannular walls formed thereon during the production of the plate as setforth and in identically the same positions as on the remaining platesof the series, said walls forming wells to receive and guide the drillused in boring the registry-holes.

3. The combination with a bed for printingpresses having ways formed inthe surface thereof, of registry-pins mounted in the Ways and adjustableto dierent places on the surface of the bed, for the purpose set forth.

4. A bed for printing-presses having slots or channels formed thereinand slides adjustable longitudinally in said channels and registry-pinsmounted in said slides as and for the purpose set forth.

5. A bed for printing-presses having channels formed therein, slidesfitted to said channels, registry-pins carried by said slides, and meansfor xing the slides in adjusted position.

G. A bed for printing-presses having underout channels formed thereinwith narrow openings in the face of the bed, slides fitted to saidchannels and filling them flush with the surface of the bed, pinscarried by said slides and projecting above the surface of the hed.

7. A bed for printing-presses for use in colorprinting having slotsformed radially therein, slides adjustable longitudinally in said slotsand registry-pins carried on the inner ends of said slides.

8. A supplemental bed for use in colorprinting having slots formedradially therein, slides adjustable longitudinally in said slots,registry-pins for a plate in one pair of opposing slides, and prick-pinsfor sheet-registry in another pair of opposing slides, substantially asset forth.

Signed at New York, in the countyof VNew York and State of New York,this 17th day of September, A. D. 1901.

CLARENCE P. EEOWNING.

Witnesses:

DELBERT H. DECKER, E. L. LAWLER.

